When you do something best in life, you don't really want to give that up - and for me it's tennis.

You always want to win. That is why you play tennis, because you love the sport and try to be the best you can at it.

I'm as patient a father as I am on the tennis court. It takes a lot for me to get really upset, but sometimes kids can get you really cross if they really keep bugging you.

I enjoyed the position I was in as a tennis player. I was to blame when I lost. I was to blame when I won. And I really like that, because I played soccer a lot too, and I couldn't stand it when I had to blame it on the goalkeeper.

I don't mind fans coming up in a friendly, respectful way. That's all part of the fun of being a top tennis player. But if people take pictures without permission, particularly if my children are in the shot, I feel uncomfortable.

Having twin girls is a life changer - that's for sure. But I like getting up and changing diapers. It's the things you do.